Apparatus for the application of hydraulic pressure to the interlor of alpha tube being shaped by the self hooping process



May 4 1926.

1 mu n my T N S I 1 5 E58 mi N a N w L l m 4 E n M m A E d e N n F APPARATUS FOR THE APPLICATION OF HYDRAULIC PRESSURE OF A TUBE BEING SHAPED BY THE SELF HOOPING P Eqv/ uncanny!- wit rm L0 Patented May 4, 192 6.

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, Application filed April 4, 1925. Serial 1%. 20,814.

To all whom it may concern:

Be it known that I, NICOLAS EMILIEN Mn'rrrnin, a citizen of the Republic of France, resident of Paris, France, have invented new and useful Improvements in Apparatus for the Application of Hydraulic Pressure to the Interior of a Tube Being Shaped by the Self-Hooping Process, which is fully set forth in the following specifica tion.

This invention relates to apparatus for self-hooping of guns, and more particularly guns of small caliber, for example of 40 mm.

In U. S. Patent No; 1,338,871, granted May 4th, 1920, there is'shown, described and claimed an apparatus of this general character employing a special joint between the closing devices and the tube to be selfhooped, which joint was so constructed as toprevent any escape of the liquid while insuring the expansion of the tube over'nearly the whole of its length, the ends which were not expanded, that is to say not self-hooped, and the length of which was very small, be-

ing cut awayas being of no use for forming formed directly between the closing devices and the parts of the tube which have to be cut off after the self-hooping operation.

One form of apparatus illustrating the present invention is shown in the accompanying drawings, in which Fig. 1 is a side elevation showing the general form of the apparatus;

Fig. 2 is an end elevation of Fig. 1 looking from the left;

Figs. 8 and 3 taken together, show a central vertical longitudinal section on an enlarged scale illustrating the invention in cletail.

As in the prior patent, mentioned above, the apparatus consists of two cross-heads A, B serving as abutments, freely movable on to the self-hooping operation are prepared suitable supports here shown as the rails D, D, and connected to each other by tie bars E.

One of the cross-heads B serves as a support for, or is provided with, a'closing device F,

while the other cross-head A is formed-s0 so as to form lodgments of the closing dey vices comprising between the'front end (H, F, respectively), the diameter of which is the same as that of the tube to be selfhooped,.and the body of the, device of larger diameter (H F respectively), a bearing shoulder H F this shoulderbeing preferably frusto conicaL The lodgment of the closing devicemust be carefully polished or ground. The closing device terminates outside of the tube in the expanded head (H F respectively) which bears against the respective cross-heads. The closing device which serves to admit liquid'isextendedv beyond the head A in tubular form and engages in said cross-head. The two closing devices are constructed of a metal having a elastic limit, the diameter of the inner end portions of said plugs being the same as that of the tube under treatment and the outer portions of said plugs being of greater diameter and having annular shoulders connecting the said inner and outer portions, said plugs and the shoulders thereon forming fluid-tight contact with corresponding surfaces within the ends of the tube under treatment, and means for moving the said cross-heads towards and from each other, whereby plastic or other packing is dispensed with, a

2. In an apparatus for the self-hooping of metal tubes,the combination of two oppositely disposed movable cross-heads, with tube-closing plugs of metal having a high elastic limit, the diameter of the inner end portions of said plugs being the same as that of the tube under treatment and the outer portions of said plugs being of greater diameter and having frusto-conical shoulders connecting the said inner and outer port ons,

said plugs and the shoulders thereon forming fluid-tight contact with corresponding sur- In testimony whereof I have signed this 15 specification.

NICOLAS EMILIEN 'METHLIN. 

